Ununpentium: the essentials
On 10 September 2013 a paper published in Phys. Rev. Lett by D. Rudolph and others outlines additional evidence for the claims that fusion-evaporation reactions between 48Ca and 243Am ions lead to the 288Uup (288115) and 287Uup (287115). A total of thirty correlated α-decay chains were observed following the reactions.
Experiments resulting in the formation of element 115 were reported in February 2004 following experiments carried out between 14 July - 10 August 2003 involving scientists at Dubna (Joint Institute for Nuclear Research at the U400 cyclotron with the Dubna gas-filled recoil separator, DGFRS) in Russia in a collaboration also involving scientists at the Lawrence Livermore National Laboratory, USA. Only four nuclei were identified and the claim has not yet been ratified, but the results are now published in a reputable peer-reviewed journal.
- Name: ununpentium
- Symbol: Uup
- Atomic number: 115
- Relative atomic mass (Ar): [ 288 ]
- Standard state: presumably a solid at 298 K
- Colour: unknown, but probably metallic and silvery white or grey in appearance
- Classification: Metallic
- Group in periodic table: 15
- Group name: Pnictogen
- Period in periodic table: 7
- Block in periodic table: p-block
- Electron shell structure: 2.8.18.32.32.18.5
- CAS Registry ID: 54085-64-2
Ununpentium: historical information
On 10 September 2013 a paper published in Phys. Rev. Lett by D. Rudolph and others outlines additional evidence for the claims that fusion-evaporation reactions between 48Ca and 243Am ions lead to the 288Uup (288115) and 287Uup (287115). A total of thirty correlated α-decay chains were observed following the reactions.
Experimental results reported in 2004 involving the bomabardment of americium-243 with calcium-48 ions are consistent with the formation in the laboratory of a few atoms of elements 113 and 115. In experiments conducted at the JINR U400 cyclotron with the Dubna gas-filled separator between July 14 and Aug. 10, 2003, atomic decay patterns were observed said to confirm the existence of element 115 and element 113. In these decay chains, element 113 is produced via the α-decay of element 115.
The results are published in the 1 February 2004 issue of Physical Review C: "Experiments on the synthesis of element 115 in the reaction 243Am(48Ca,xn)291–x115", Yu. Ts. Oganessian, V. K. Utyonkoy, Yu. V. Lobanov, F. Sh. Abdullin, A. N. Polyakov, I. V. Shirokovsky, Yu. S. Tsyganov, G. G. Gulbekian, S. L. Bogomolov, A. N. Mezentsev, S. Iliev, V. G. Subbotin, A. M. Sukhov, A. A. Voinov, G. V. Buklanov, K. Subotic, V. I. Zagrebaev, M. G. Itkis, J. B. Patin, K. J. Moody, J. F. Wild, M. A. Stoyer, N. J. Stoyer, D. A. Shaughnessy, J. M. Kenneally, and R. W. Lougheed, Phys. Rev. C, 2004, 69, 021601(R).
Ununpentium around us Read more »
As only a very few atoms of element 115 have ever been made, it has no biological role.
Element 115 (ununpentium, Uup) does not occur at all in the geosphere.
| Location | ppb by weight | ppb by atoms | Links |
|---|---|---|---|
| Universe | (no data) | (no data) | 
|
| Crustal rocks | (no data) | (no data) | 
|
| Human | (no data) ppb by weight | (no data) atoms relative to C = 1000000 | 
|
Physical properties Read more »
Density of solid: 13000 (predicted) kg m-3
Molar volume: 22 (rough estimate based upon density estimate) cm3
Thermal conductivity: (no data) W m‑1 K‑1
Heat properties Read more »
Melting point: (no data) K
Boiling point: (no data) K
Enthalpy of fusion: (no data) kJ mol-1
Crystal structure Read more »
The solid state structure of ununpentium is: .
Ununpentium: orbital properties Read more »
Ununpentium atoms have 115 electrons and the shell structure is 2.8.18.32.32.18.5. The ground state electronic configuration of neutral Ununpentium is [Rn].5f14.6d10.7s2.7p3 (a guess based upon that of bismuth) and the term symbol of Ununpentium is 4S3/2 (a guess based upon guessed electronic structure).
Pauling electronegativity: (no data) (Pauling units)
First ionisation energy: (no data) kJ mol‑1
Second ionisation energy: (no data) kJ mol‑1
Isolation
Isolation: currently, the identification of element 115 is yet to be confirmed by IUPAC, but the experiments leading to element 115 are now published in a prestigious peer reviewed journal. As only about four atoms of element 115 have ever been made (through nuclear reactions involving fusing calcium nuclei with americium nuclei) isolation of an observable quantity has never been achieved, and may well never be.
24395Am + 4820Ca → 287115Uup + 4 1n
24395Am + 4820Ca → 288115Uup + 3 1n
In these first experiments, three nuclei of the 288Uup isotope were made and one of the 287Uup isotope. All the nuclei formed decayed in less than a second by emitting α-particles. These decays resulted in isotopes of element 113 (mass number 283 or 284, containing 113 protons and either 170 or 171 neutrons). These isotopes of element 113 are also radioactive and underwent further α-decay processes to isotopes of element 111 and so on down to at least element 105 (dubnium).
287115Uup → 283113Uut + 42He (46.6 milliseconds)
288115Uup → 284113Uut + 42He (80.3 milliseconds)
288115Uup → 284113Uut + 42He (18.6 milliseconds)
288115Uup → 284113Uut + 42He (280 milliseconds)
Ununpentium isotopes Read more »
| Isotope | Mass /Da |
Natural abund. (atom %) |
Nuclear spin (I) |
Nuclear magnetic moment (μ/μN) |
|---|---|---|---|---|
| nil |
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